Merge "Report user_cancellation when the user back scroll from the UI...

Merge "Report user_cancellation when the user back scroll from the UI activity" into udc-dev am: b21390f0 am: 366340e6 am: 5d2844eb am: 8ce3295f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22980754



Change-Id: I08ce6128e5c8d88f6f03259589b974eb5c617f9d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>